suzanne pratt, nbr, new york. >> tom: still ahead, as the debate over mitt romney's taxes shows, not all income is taxed the same. why how much you pay in taxes depends on how you make your money. four years ago this month, the economy was in a freefall. lehman brothers had collapsed and credit markets seized up. a.i.g. was rescued by the federal reserve. the tarp program spent billions bailing out banks, and the federal deposit insurance corporation helped save citigroup. sheila bair was among those making the decisions. she was the chairman of the fdic and has written about the financial crisis in a new book, "bull by the horns. " she join us tonight from the nasdaq. sheila, congratulations on the book. quite a read to relive those days and months four years ago. after all the billions of dollars spent and the millions of homes foreclosed on, you wrote, i wonder if we overreacted. you say the generosity of the response troubles you, why? >> the generosity of the banks. we clearly needed to do something. weeshtd have done more to get the homeowners restructured and clean up the bank